Firetech   /   Steel protection

Firetech   /   Steel protection

Thanks to their high mechanical strength and their flexibility steel structures have been increasingly used in constructions. But due to its very high thermal conductivity steel is subject to overheating with consequent reduction of mechanical resistance according to the temperature. At around 200°C steel starts reducing its properties of mechanical resistance and at 500°C this reduction starts influencing loading capacity. Protection of steel structures must be calculated on the basis of the so-called critical temperature defined to as the temperature at which steel structure looses its loading capacity. Critical temperature depends on load and class of profile. Class is defined on the basis of the relationship between width and thickness of section components, stress and resistance class of material.

There are 4 classes of profile: with the exception of the 4thclass whose critical temperature is 350°C in all other cases critical temperature is established by technicians and it depends on several factors such as kind of project, tipology of stress, fire exposure.

Critical temperature for beam is around 500°C and for column around 450°C.